Method: Webhookdb::Message.render

Defined in:
lib/webhookdb/message.rb

.render(template, transport_type, recipient) ⇒ Object

Render the transport-specific version of the given template and return a the rendering (content and exposed variables).

Templates can expose data to the caller by using the ‘expose’ tag, like expose subject %Hello from Webhookdb{% endexpose %}. This is available as [:subject] on the returned rendering.

Raises:



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# File 'lib/webhookdb/message.rb', line 67

def self.render(template, transport_type, recipient)
  template_file = template.template_path(transport_type)
  raise MissingTemplateError, "#{template_file} does not exist" unless template_file.exist?

  drops = template.liquid_drops.stringify_keys.merge(
    "recipient" => Webhookdb::Message::CustomerDrop.new(recipient),
    "environment" => Webhookdb::Message::EnvironmentDrop.new,
    "app_url" => Webhookdb.app_url,
  )
  drops = self.unify_drops_encoding(drops)

  content_tmpl = Liquid::Template.parse(template_file.read)
  # The 'expose' drop smashes data into the register.
  # We need to keep track of the register to get the subject back out,
  # so we need to make our own context.
  lctx = Liquid::Context.new(
    [drops, content_tmpl.assigns],
    content_tmpl.instance_assigns,
    content_tmpl.registers,
    true,
    content_tmpl.resource_limits,
  )
  content = content_tmpl.render!(lctx, strict_variables: true)

  transport = Webhookdb::Message::Transport.for(transport_type)
  if transport.supports_layout?
    layout_file = template.layout_path(transport_type)
    if layout_file
      raise MissingTemplateError, "#{template_file} does not exist" unless layout_file.exist?
      layout_tmpl = Liquid::Template.parse(layout_file.read)
      drops["content"] = content.dup
      content = layout_tmpl.render!(drops, strict_variables: true, registers: content_tmpl.registers)
    end
  end

  return Rendering.new(content, lctx.registers)
end